How to Offset Geometry of a Text Converted to Mesh
If I understand correctly your question, first simplify your letters topology with X &gt; Limited Dissolve.
For some letters a simple inset (i) will work (and then invert the selection with Ctrli and delete the outer edges):

For some other letters it won't work and you'll have to extrude them, Shrink/Fatten with AltS, and delete the extrusion: